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comparison src/timer/mint/SDL_systimer.c @ 281:c5010ab8ba35

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Added initial support for Atari (thanks Patrice!)
author Sam Lantinga <slouken@libsdl.org>
date Sun, 17 Feb 2002 19:54:28 +0000
parents
children f6ffac90895c
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280:0ddcea45d829 281:c5010ab8ba35
1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public
7 License as published by the Free Software Foundation; either
8 version 2 of the License, or (at your option) any later version.
9
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
14
15 You should have received a copy of the GNU Library General Public
16 License along with this library; if not, write to the Free
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
19 Sam Lantinga
20 slouken@libsdl.org
21 */
22
23 #ifdef SAVE_RCSID
24 static char rcsid =
25 "@(#) $Id$";
26 #endif
27
28 /*
29 * TOS/MiNT timer driver
30 * based on vbl vector
31 *
32 * Patrice Mandin
33 */
34
35 #include <stdio.h>
36 #include <sys/time.h>
37 #include <signal.h>
38 #include <unistd.h>
39 #include <string.h>
40 #include <errno.h>
41
42 #include <mint/osbind.h>
43 #include <sysvars.h>
44
45 #include "SDL_error.h"
46 #include "SDL_timer.h"
47 #include "SDL_timer_c.h"
48 #include "SDL_thread.h"
49
50 #include "SDL_vbltimer_s.h"
51
52 /* The first ticks value of the application */
53 static Uint32 start;
54 static SDL_bool supervisor;
55
56 void SDL_StartTicks(void)
57 {
58 void *oldpile;
59
60 /* Set first ticks value */
61 oldpile=(void *)Super(0);
62 start=*((volatile long *)_hz_200);
63 Super(oldpile);
64
65 start *= 5; /* One _hz_200 tic is 5ms */
66 }
67
68 Uint32 SDL_GetTicks (void)
69 {
70 Uint32 now;
71 void *oldpile;
72
73 /* Check if we are in supervisor mode
74 (this is the case when called from SDL_ThreadedTimerCheck,
75 which is called from RunTimer, running in the vbl vector)
76 */
77 if (!supervisor) {
78 oldpile=(void *)Super(0);
79 }
80
81 now=*((volatile long *)_hz_200);
82
83 if (!supervisor) {
84 Super(oldpile);
85 }
86
87 return((now*5)-start);
88 }
89
90 void SDL_Delay (Uint32 ms)
91 {
92 Uint32 now;
93
94 now = SDL_GetTicks();
95 while ((SDL_GetTicks()-now)<ms){
96 }
97 }
98
99 /* Data to handle a single periodic alarm */
100 static SDL_bool timer_installed=SDL_FALSE;
101
102 static void RunTimer(void)
103 {
104 supervisor=SDL_TRUE;
105 SDL_ThreadedTimerCheck();
106 supervisor=SDL_FALSE;
107 }
108
109 /* This is only called if the event thread is not running */
110 int SDL_SYS_TimerInit(void)
111 {
112 void *oldpile;
113
114 supervisor=SDL_FALSE;
115
116 /* Install RunTimer in vbl vector */
117 oldpile=(void *)Super(0);
118 timer_installed = !SDL_AtariVblInstall(RunTimer);
119 Super(oldpile);
120
121 if (!timer_installed) {
122 return(-1);
123 }
124 return(SDL_SetTimerThreaded(0));
125 }
126
127 void SDL_SYS_TimerQuit(void)
128 {
129 void *oldpile;
130
131 if (timer_installed) {
132 /* Uninstall RunTimer vbl vector */
133 oldpile=(void *)Super(0);
134 SDL_AtariVblUninstall(RunTimer);
135 Super(oldpile);
136 timer_installed = SDL_FALSE;
137 }
138 }
139
140 int SDL_SYS_StartTimer(void)
141 {
142 SDL_SetError("Internal logic error: MiNT uses vbl timer");
143 return(-1);
144 }
145
146 void SDL_SYS_StopTimer(void)
147 {
148 return;
149 }